31303045220 has 12 divisors (see below), whose sum is σ = 65736395004. Its totient is φ = 12521218080.

The previous prime is 31303045211. The next prime is 31303045223. The reversal of 31303045220 is 2254030313.

It can be written as a sum of positive squares in 2 ways, for example, as 18338034724 + 12965010496 = 135418^2 + 113864^2 .

It is not an unprimeable number, because it can be changed into a prime (31303045223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782576111 + ... + 782576150.

It is an arithmetic number, because the mean of its divisors is an integer number (5478032917).

Almost surely, 2^31303045220 is an apocalyptic number.

It is an amenable number.

31303045220 is an abundant number, since it is smaller than the sum of its proper divisors (34433349784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31303045220 is a wasteful number, since it uses less digits than its factorization.

31303045220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565152270 (or 1565152268 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

Adding to 31303045220 its reverse (2254030313), we get a palindrome (33557075533).

The spelling of 31303045220 in words is "thirty-one billion, three hundred three million, forty-five thousand, two hundred twenty".